How to call a callback with libuv in Node.js V12

[Jake Le]

In Node.js v0.10.xx, calling a callback requires a Persistent<Function>.    Does anyone know to make the below code work in Node.js V12?

struct Baton {
      uv_work_t request;
      Persistent<Function> callback;
};

somefunction() {
...

Baton *baton = new Baton();
baton->request.data = baton;
baton->callback = Persistent<Function>::New(Handle<Function>::Cast(args[0]));

uv_queue_work(uv_default_loop(), &baton->request, Work, AfterWork);..
}

void AfterWork(uv_work_t *req) {
  Baton *baton = static_cast<Baton *>(req->data);
  HandleScope scope;
  
  const int argc = 1;
  Handle<Value> argv[argc] = { String::NewFromUtf8(isolate, "hello world") };
  
  TryCatch try_catch;
  baton->callback->Call(Context::GetCurrent()->Global(), argc, argv);
  
  if (try_catch.HasCaught()) {
     node::FatalException(try_catch);
  }

      baton->callback.Dispose();
      baton->callback.Clear();
..
}

Thanks,
-Jake

[Christian Taltas]

Hi Jake

It is worth reading strongloop blog:

http://strongloop.com/strongblog/node-js-v0-12-c-apis-breaking/

Regards

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[Jake Le]

Christian,

Thank you very much.  It was  the Persistent<Function> conversion that I needed.  Great blog!!! :)

-Jake

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